Hello everyone,
The attached circuit is a 48VDC (50 Ampere) solar charge controller.We have been using this circuit (attached) at many sites to charging 48V batteries. The circuit is designed to work as follows.
1) This is a simple ON/OFF charger (No PWM)
2) start charging if battery voltage is below 52V
3) cut off the charging at approx. 55V (maintaining hysterisis)
The problem we are facing are:
1) At some odd instances, the gate voltage becomes abnormal resulting in FET (IRFB4321) being neither turn OFF completely nor fully turned ON and FET are seen burnt.
2) Once the FET are burnt the circuit would no longer controls the charging.
Suggestions for solving this issue would be appreciated.
DJS
The attached circuit is a 48VDC (50 Ampere) solar charge controller.We have been using this circuit (attached) at many sites to charging 48V batteries. The circuit is designed to work as follows.
1) This is a simple ON/OFF charger (No PWM)
2) start charging if battery voltage is below 52V
3) cut off the charging at approx. 55V (maintaining hysterisis)
The problem we are facing are:
1) At some odd instances, the gate voltage becomes abnormal resulting in FET (IRFB4321) being neither turn OFF completely nor fully turned ON and FET are seen burnt.
2) Once the FET are burnt the circuit would no longer controls the charging.
Suggestions for solving this issue would be appreciated.
DJS
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